/* Unix SMB/CIFS implementation. Database interface wrapper around ctdbd Copyright (C) Andrew Tridgell 2007 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "../tdb/include/tdb.h" #include "lib/dbwrap/dbwrap.h" #include "cluster/cluster.h" #include "cluster/ctdb/include/ctdb.h" static NTSTATUS db_ctdb_store(struct db_record *rec, TDB_DATA data, int flag) { struct ctdb_record_handle *h = talloc_get_type(rec->private_data, struct ctdb_record_handle); int ret; ret = ctdb_record_store(h, data); if (ret != 0) { return NT_STATUS_INTERNAL_DB_CORRUPTION; } return NT_STATUS_OK; } static NTSTATUS db_ctdb_delete(struct db_record *rec) { return rec->store(rec, tdb_null, TDB_REPLACE); } static struct db_record *db_ctdb_fetch_locked(struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key) { struct db_record *rec; struct ctdb_record_handle *h; struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); rec = talloc(mem_ctx, struct db_record); if (!rec) return NULL; h = ctdb_fetch_lock(cdb, rec, key, &rec->value); if (h == NULL) { talloc_free(rec); return NULL; } rec->private_data = h; rec->store = db_ctdb_store; rec->delete_rec = db_ctdb_delete; return rec; } /* fetch (unlocked, no migration) operation on ctdb */ static int db_ctdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key, TDB_DATA *data) { struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); return ctdb_fetch(cdb, mem_ctx, key, data); } struct traverse_state { struct db_context *db; int (*fn)(struct db_record *rec, void *private_data); void *private_data; }; static int traverse_callback(struct ctdb_context *ctdb, TDB_DATA key, TDB_DATA data, void *private_data) { struct traverse_state *state = (struct traverse_state *)private_data; struct db_record *rec; TALLOC_CTX *tmp_ctx = talloc_new(state->db); /* we have to give them a locked record to prevent races */ rec = db_ctdb_fetch_locked(state->db, tmp_ctx, key); if (rec && rec->value.dsize > 0) { state->fn(rec, state->private_data); } talloc_free(tmp_ctx); return 0; } static int db_ctdb_traverse(struct db_context *db, int (*fn)(struct db_record *rec, void *private_data), void *private_data) { struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); struct traverse_state state; state.db = db; state.fn = fn; state.private_data = private_data; ctdb_traverse(cdb, traverse_callback, &state); return 0; } static NTSTATUS db_ctdb_store_deny(struct db_record *rec, TDB_DATA data, int flag) { return NT_STATUS_MEDIA_WRITE_PROTECTED; } static NTSTATUS db_ctdb_delete_deny(struct db_record *rec) { return NT_STATUS_MEDIA_WRITE_PROTECTED; } static int traverse_read_callback(struct ctdb_context *ctdb, TDB_DATA key, TDB_DATA data, void *private_data) { struct traverse_state *state = (struct traverse_state *)private_data; struct db_record rec; rec.key = key; rec.value = data; rec.store = db_ctdb_store_deny; rec.delete_rec = db_ctdb_delete_deny; rec.private_data = state->db; state->fn(&rec, state->private_data); return 0; } static int db_ctdb_traverse_read(struct db_context *db, int (*fn)(struct db_record *rec, void *private_data), void *private_data) { struct traverse_state state; struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); state.db = db; state.fn = fn; state.private_data = private_data; ctdb_traverse(cdb, traverse_read_callback, &state); return 0; } static int db_ctdb_get_seqnum(struct db_context *db) { DEBUG(0,("ctdb_get_seqnum not implemented\n")); return -1; } struct db_context *db_tmp_open_ctdb(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, const char *name, int tdb_flags) { struct db_context *db; struct ctdb_context *ctdb = talloc_get_type(cluster_backend_handle(), struct ctdb_context); struct ctdb_db_context *cdb; db = talloc_zero(mem_ctx, struct db_context); if (db == NULL) { return NULL; } cdb = ctdb_attach(ctdb, name); if (!cdb) { DEBUG(0,("Failed to attach to ctdb database '%s'\n", name)); talloc_free(db); return NULL; } db->private_data = cdb; db->fetch_locked = db_ctdb_fetch_locked; db->fetch = db_ctdb_fetch; db->traverse = db_ctdb_traverse; db->traverse_read = db_ctdb_traverse_read; db->get_seqnum = db_ctdb_get_seqnum; DEBUG(3,("db_tmp_open_ctdb: opened database '%s'\n", name)); return db; }